imx8-power-domain-legacy.c 7.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright 2017 NXP
  4. */
  5. #include <common.h>
  6. #include <dm.h>
  7. #include <power-domain-uclass.h>
  8. #include <asm/io.h>
  9. #include <asm/arch/power-domain.h>
  10. #include <dm/device-internal.h>
  11. #include <dm/device.h>
  12. #include <asm/arch/sci/sci.h>
  13. DECLARE_GLOBAL_DATA_PTR;
  14. struct imx8_power_domain_priv {
  15. bool state_on;
  16. };
  17. static int imx8_power_domain_request(struct power_domain *power_domain)
  18. {
  19. debug("%s(power_domain=%p)\n", __func__, power_domain);
  20. return 0;
  21. }
  22. static int imx8_power_domain_free(struct power_domain *power_domain)
  23. {
  24. debug("%s(power_domain=%p)\n", __func__, power_domain);
  25. return 0;
  26. }
  27. static int imx8_power_domain_on(struct power_domain *power_domain)
  28. {
  29. struct udevice *dev = power_domain->dev;
  30. struct imx8_power_domain_platdata *pdata;
  31. struct imx8_power_domain_priv *ppriv;
  32. sc_err_t ret;
  33. int err;
  34. struct power_domain parent_domain;
  35. struct udevice *parent = dev_get_parent(dev);
  36. /* Need to power on parent node first */
  37. if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
  38. parent_domain.dev = parent;
  39. err = imx8_power_domain_on(&parent_domain);
  40. if (err)
  41. return err;
  42. }
  43. pdata = (struct imx8_power_domain_platdata *)dev_get_platdata(dev);
  44. ppriv = (struct imx8_power_domain_priv *)dev_get_priv(dev);
  45. debug("%s(power_domain=%s) resource_id %d\n", __func__, dev->name,
  46. pdata->resource_id);
  47. /* Already powered on */
  48. if (ppriv->state_on)
  49. return 0;
  50. if (pdata->resource_id != SC_R_LAST) {
  51. ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
  52. SC_PM_PW_MODE_ON);
  53. if (ret) {
  54. printf("Error: %s Power up failed! (error = %d)\n",
  55. dev->name, ret);
  56. return -EIO;
  57. }
  58. }
  59. ppriv->state_on = true;
  60. debug("%s is powered on\n", dev->name);
  61. return 0;
  62. }
  63. static int imx8_power_domain_off_node(struct power_domain *power_domain)
  64. {
  65. struct udevice *dev = power_domain->dev;
  66. struct udevice *child;
  67. struct imx8_power_domain_priv *ppriv;
  68. struct imx8_power_domain_priv *child_ppriv;
  69. struct imx8_power_domain_platdata *pdata;
  70. sc_err_t ret;
  71. ppriv = dev_get_priv(dev);
  72. pdata = dev_get_platdata(dev);
  73. debug("%s, %s, state_on %d\n", __func__, dev->name, ppriv->state_on);
  74. /* Already powered off */
  75. if (!ppriv->state_on)
  76. return 0;
  77. /* Check if all subnodes are off */
  78. for (device_find_first_child(dev, &child);
  79. child;
  80. device_find_next_child(&child)) {
  81. if (device_active(child)) {
  82. child_ppriv =
  83. (struct imx8_power_domain_priv *)dev_get_priv(child);
  84. if (child_ppriv->state_on)
  85. return -EPERM;
  86. }
  87. }
  88. if (pdata->resource_id != SC_R_LAST) {
  89. if (!sc_rm_is_resource_owned(-1, pdata->resource_id)) {
  90. printf("%s not owned by curr partition\n", dev->name);
  91. return 0;
  92. }
  93. ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
  94. SC_PM_PW_MODE_OFF);
  95. if (ret) {
  96. printf("Error: %s Power off failed! (error = %d)\n",
  97. dev->name, ret);
  98. return -EIO;
  99. }
  100. }
  101. ppriv->state_on = false;
  102. debug("%s is powered off\n", dev->name);
  103. return 0;
  104. }
  105. static int imx8_power_domain_off_parentnodes(struct power_domain *power_domain)
  106. {
  107. struct udevice *dev = power_domain->dev;
  108. struct udevice *parent = dev_get_parent(dev);
  109. struct udevice *child;
  110. struct imx8_power_domain_priv *ppriv;
  111. struct imx8_power_domain_priv *child_ppriv;
  112. struct imx8_power_domain_platdata *pdata;
  113. sc_err_t ret;
  114. struct power_domain parent_pd;
  115. if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
  116. pdata =
  117. (struct imx8_power_domain_platdata *)dev_get_platdata(parent);
  118. ppriv = (struct imx8_power_domain_priv *)dev_get_priv(parent);
  119. debug("%s, %s, state_on %d\n", __func__, parent->name,
  120. ppriv->state_on);
  121. /* Already powered off */
  122. if (!ppriv->state_on)
  123. return 0;
  124. /*
  125. * Check if all sibling nodes are off. If yes,
  126. * power off parent
  127. */
  128. for (device_find_first_child(parent, &child); child;
  129. device_find_next_child(&child)) {
  130. if (device_active(child)) {
  131. child_ppriv = (struct imx8_power_domain_priv *)
  132. dev_get_priv(child);
  133. /* Find a power on sibling */
  134. if (child_ppriv->state_on) {
  135. debug("sibling %s, state_on %d\n",
  136. child->name,
  137. child_ppriv->state_on);
  138. return 0;
  139. }
  140. }
  141. }
  142. /* power off parent */
  143. if (pdata->resource_id != SC_R_LAST) {
  144. ret = sc_pm_set_resource_power_mode(-1,
  145. pdata->resource_id,
  146. SC_PM_PW_MODE_OFF);
  147. if (ret) {
  148. printf("%s Power off failed! (error = %d)\n",
  149. parent->name, ret);
  150. return -EIO;
  151. }
  152. }
  153. ppriv->state_on = false;
  154. debug("%s is powered off\n", parent->name);
  155. parent_pd.dev = parent;
  156. imx8_power_domain_off_parentnodes(&parent_pd);
  157. }
  158. return 0;
  159. }
  160. static int imx8_power_domain_off(struct power_domain *power_domain)
  161. {
  162. int ret;
  163. debug("%s(power_domain=%p)\n", __func__, power_domain);
  164. /* Turn off the node */
  165. ret = imx8_power_domain_off_node(power_domain);
  166. if (ret) {
  167. debug("Can't power off the node of dev %s, ret = %d\n",
  168. power_domain->dev->name, ret);
  169. return ret;
  170. }
  171. /* Turn off parent nodes, if sibling nodes are all off */
  172. ret = imx8_power_domain_off_parentnodes(power_domain);
  173. if (ret) {
  174. printf("Failed to power off parent nodes of dev %s, ret = %d\n",
  175. power_domain->dev->name, ret);
  176. return ret;
  177. }
  178. return 0;
  179. }
  180. static int imx8_power_domain_of_xlate(struct power_domain *power_domain,
  181. struct ofnode_phandle_args *args)
  182. {
  183. debug("%s(power_domain=%p)\n", __func__, power_domain);
  184. /* Do nothing to the xlate, since we don't have args used */
  185. return 0;
  186. }
  187. static int imx8_power_domain_bind(struct udevice *dev)
  188. {
  189. int offset;
  190. const char *name;
  191. int ret = 0;
  192. debug("%s(dev=%p)\n", __func__, dev);
  193. offset = dev_of_offset(dev);
  194. for (offset = fdt_first_subnode(gd->fdt_blob, offset); offset > 0;
  195. offset = fdt_next_subnode(gd->fdt_blob, offset)) {
  196. /* Bind the subnode to this driver */
  197. name = fdt_get_name(gd->fdt_blob, offset, NULL);
  198. ret = device_bind_with_driver_data(dev, dev->driver, name,
  199. dev->driver_data,
  200. offset_to_ofnode(offset),
  201. NULL);
  202. if (ret == -ENODEV)
  203. printf("Driver '%s' refuses to bind\n",
  204. dev->driver->name);
  205. if (ret)
  206. printf("Error binding driver '%s': %d\n",
  207. dev->driver->name, ret);
  208. }
  209. return 0;
  210. }
  211. static int imx8_power_domain_probe(struct udevice *dev)
  212. {
  213. struct imx8_power_domain_priv *ppriv;
  214. debug("%s(dev=%s)\n", __func__, dev->name);
  215. ppriv = (struct imx8_power_domain_priv *)dev_get_priv(dev);
  216. /* Set default to power off */
  217. if (ppriv)
  218. ppriv->state_on = false;
  219. return 0;
  220. }
  221. static int imx8_power_domain_ofdata_to_platdata(struct udevice *dev)
  222. {
  223. int reg;
  224. struct imx8_power_domain_platdata *pdata = dev_get_platdata(dev);
  225. reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", -1);
  226. if (reg == -1) {
  227. debug("%s: Invalid resource id %d\n", __func__, reg);
  228. return -EINVAL;
  229. }
  230. pdata->resource_id = (sc_rsrc_t)reg;
  231. debug("%s resource_id %d\n", __func__, pdata->resource_id);
  232. return 0;
  233. }
  234. static const struct udevice_id imx8_power_domain_ids[] = {
  235. { .compatible = "nxp,imx8-pd" },
  236. { }
  237. };
  238. struct power_domain_ops imx8_power_domain_ops = {
  239. .request = imx8_power_domain_request,
  240. .rfree = imx8_power_domain_free,
  241. .on = imx8_power_domain_on,
  242. .off = imx8_power_domain_off,
  243. .of_xlate = imx8_power_domain_of_xlate,
  244. };
  245. U_BOOT_DRIVER(imx8_power_domain) = {
  246. .name = "imx8_power_domain",
  247. .id = UCLASS_POWER_DOMAIN,
  248. .of_match = imx8_power_domain_ids,
  249. .bind = imx8_power_domain_bind,
  250. .probe = imx8_power_domain_probe,
  251. .ofdata_to_platdata = imx8_power_domain_ofdata_to_platdata,
  252. .platdata_auto_alloc_size = sizeof(struct imx8_power_domain_platdata),
  253. .priv_auto_alloc_size = sizeof(struct imx8_power_domain_priv),
  254. .ops = &imx8_power_domain_ops,
  255. };